Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5f3001efbd1aef…

MALICIOUS

PDF

36.3 KB Created: 2021-07-05 09:36:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2578af2c7aeccc7dd54bc12553be604c SHA-1: ca9449c3c63ae4756309fe1b11ed0ae2d0e65566 SHA-256: 3c5f3001efbd1aef467c8c0b2c6debb99b286d1a72a84af04b0576720499a5ba
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-unlimited-spins-apk-free-download-game-hack. This lure aims to trick users into downloading potentially unwanted or malicious software. No scripts were extracted, but the embedded URLs and the nature of the lure strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/406889139/coin-master-unlimited-spins-apk-free-download-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/simple-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-hack-code-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pubg-uc-500_GM1330123889.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/where-to-find-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/all-google-exclusive-free-roblox-items_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/get-robux-free-for-reel-no-get-someting-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003403.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3403 23048 bytes
SHA-256: 906941afab7ad4ad3c7112da6335016293a02c44c296cc5d10808e9c3263719a
font_01_sfnt_off00006803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6803 19368 bytes
SHA-256: 8b0685dcc048d8507013793e7e40f4e8e130d168f30120dc551c0829f220b5a1

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